(function (window) {

    'use strict';

    // class helper functions from bonzo https://github.com/ded/bonzo

    function classReg(className) {

        return new RegExp("(^|\\s+)" + className + "(\\s+|$)");

    }

    // classList support for class management

    // altho to be fair, the api sucks because it won't accept multiple classes at once

    var hasClass,

    addClass,

    removeClass;

    if ('classList' in document.documentElement) {

        hasClass = function (elem, c) {

            return elem.classList.contains(c);

        };

        addClass = function (elem, c) {

            elem.classList.add(c);

        };

        removeClass = function (elem, c) {

            elem.classList.remove(c);

        };

    } else {

        hasClass = function (elem, c) {

            return classReg(c).test(elem.className);

        };

        addClass = function (elem, c) {

            if (!hasClass(elem, c)) {

                elem.className = elem.className + ' ' + c;

            }

        };

        removeClass = function (elem, c) {

            elem.className = elem.className.replace(classReg(c), ' ');

        };

    }

    function toggleClass(elem, c) {

        var fn = hasClass(elem, c) ? removeClass : addClass;

        fn(elem, c);

    }

    var classie = {

        // full names

        hasClass : hasClass,

        addClass : addClass,

        removeClass : removeClass,

        toggleClass : toggleClass,

        // short names

        has : hasClass,

        add : addClass,

        remove : removeClass,

        toggle : toggleClass

    };

    // transport

    if (typeof define === 'function' && define.amd) {

        // AMD

        define(classie);

    } else {

        // browser global

        window.classie = classie;

    }

})(window);